Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea85a4f8cfc100b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 05:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: afefb70c629bec4719b1a45c5c72ecd2 SHA-1: 8ab0a114224ea2235a9d73064242e9c454865a15 SHA-256: 6ea85a4f8cfc100b9101fbe791135bd430e219f6e066e297400600f9cab7caad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to potentially disposable domains, which is characteristic of phishing or link-farming operations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/34577438190.pdf In PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/rejale.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7j90pi0f2ahjalapgmjp206psv/pudenafererizebavurowud.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/fonemijakotira.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/25428839174.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/35830312274.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/93437512489.pdfIn PDF document text
    • http://c-six.it/userfiles/files/pimogekonuvekajepatag.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/29586995187.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/57152441528.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/46882768109.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614163394312d---pibafazejo.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/febogudepavoxupano.pdfIn PDF document text
    • http://santeh.md/img/files/butogomunujosukezigepo.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/49215338588.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/nepot.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/1142822217.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/19100169596.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/zadin.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/20172555184.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/93447553316.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/46377666121.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///31719592858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=captain+america+2+123moviesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 10932 bytes
SHA-256: 6ff5bef9792760c10383b6ada871640c40b32760bfab9784ab8a3ed2e6430ef8
font_02_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 17656 bytes
SHA-256: 77db7925948dd65c6b2797dde5e5612367890920eca8c5949f0eb7a6771f31fe

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